Assertion (A): Separate sewer systems are often preferred in modern urban planning. Reason (R): Separate systems reduce the hydraulic load on treatment plants during heavy rainfall. Choose the correct option: (A) Both (A) and (R) are correct and (R) explains
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)Correct
- BBoth (A) and (R) are correct but (R) does not explain (A)
- C(A) is correct, (R) is incorrect
- D(A) is incorrect, (R) is correct
Solution
Concept
Separate Sewer System
Formula
N/A
Step-by-step solution
1. Evaluate Assertion (A): Separate sewer systems are preferred in modern urban planning, which is correct. 2. Evaluate Reason (R): Separate systems reduce the hydraulic load on treatment plants during heavy rainfall, which is also correct. 3. Confirm that Reason (R) is the correct explanation for Assertion (A). 4. Select Option (A) as the correct choice.
Explanation
In a separate sewer system, sewage and stormwater flow through two different sets of pipes. Because rainwater does not enter the sewage pipes, sewage treatment plants do not get overwhelmed during heavy rain, allowing them to process wastewater efficiently without exceeding capacity.
Shortcut
To remember why Separate Sewer Systems are preferred, use the phrase "Separate = No Rain Load": - Separate Pipes: Sewage and rainwater flow in completely independent networks. - No Overload: Rainwater does not enter treatment plants, preventing hydraulic overloading during heavy rain.
Common mistake
A common mistake is selecting Option B by recognizing that both statements are true but failing to link them, missing that reducing the hydraulic load during heavy rain is the direct technical reason why separate systems are preferred. Another frequent mistake is confusing separate systems with combined systems and incorrectly assuming that stormwater enters the same sewers, leading to Option C.
Correct answer: A) Both (A) and (R) are correct and (R) is the correct explanation of (A)